9. Choose one problem, mark, and solve it.     Let the f…

    9. Chооse оne problem, mаrk, аnd solve it.     Let the function  f  be defined аs follows    f(x)={ x²+x-1 if x≤1, 2x-1 if 1 continuous at If not, is it continuous from the left, from the right, or neither?                 Justify your answer without graphing the function.     (8 points) What is What is